s390: Fix FunctionBodyDecoderTest to compile with gcc4.8.5

test/unittests/wasm/function-body-decoder-unittest.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "test/unittests/test-utils.h"
 
 #include "src/v8.h"
 
 #include "test/common/wasm/test-signatures.h"
 
@@ skipping 1836 matching lines @@
 }
 
 TEST_F(FunctionBodyDecoderTest, BreakNesting_6_levels) {
   for (int mask = 0; mask < 64; mask++) {
     for (int i = 0; i < 14; i++) {
       byte code[] = {WASM_BLOCK(WASM_BLOCK(
           WASM_BLOCK(WASM_BLOCK(WASM_BLOCK(WASM_BLOCK(WASM_BR(i)))))))};
 
       int depth = 6;
       int m = mask;
-      for (size_t pos = 0; pos < sizeof(code); pos++) {
+      for (size_t pos = 0; pos < sizeof(code) - 1; pos++) {
         if (code[pos] != kExprBlock) continue;
         if (m & 1) {
           code[pos] = kExprLoop;
           code[pos + 1] = kLocalVoid;
         }
         m >>= 1;
       }
 
       if (i <= depth) {
         EXPECT_VERIFIES_C(v_v, code);
@@ skipping 868 matching lines @@
   iter.next();
   EXPECT_TRUE(iter.has_next());
   EXPECT_EQ(kExprI8Const, iter.current());
   iter.next();
   EXPECT_FALSE(iter.has_next());
 }
 
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8